diff --git a/axum-macros/src/lib.rs b/axum-macros/src/lib.rs
index 3d864cd5..3f1a7db2 100644
--- a/axum-macros/src/lib.rs
+++ b/axum-macros/src/lib.rs
@@ -722,7 +722,7 @@ fn run_ui_tests(directory: &str) {
     }
 
     #[rustversion::not(stable)]
-    fn go(directory: &str) {}
+    fn go(_directory: &str) {}
 
     go(directory);
 }